diff --git a/src/pg/test/expected/08_interpolation_test.out b/src/pg/test/expected/08_interpolation_test.out
index 42d24cb..c13a547 100644
--- a/src/pg/test/expected/08_interpolation_test.out
+++ b/src/pg/test/expected/08_interpolation_test.out
@@ -1,4 +1,7 @@
- cdb_spatialinterpolation
---------------------------
- 780.79470198683925288365
+SET client_min_messages TO WARNING;
+\set ECHO none
+ nn  |           nni            |       idw       
+-----+--------------------------+-----------------
+ 200 | 780.79470198683925288365 | 341.46260750526
 (1 row)
+
diff --git a/src/pg/test/sql/08_interpolation_test.sql b/src/pg/test/sql/08_interpolation_test.sql
index c8db89d..cb0d2e4 100644
--- a/src/pg/test/sql/08_interpolation_test.sql
+++ b/src/pg/test/sql/08_interpolation_test.sql
@@ -1,6 +1,12 @@
+SET client_min_messages TO WARNING;
+\set ECHO none
 WITH a AS (
     SELECT
     ARRAY[800, 700, 600, 500, 400, 300, 200, 100] AS vals,
     ARRAY[ST_GeomFromText('POINT(2.1744 41.403)'),ST_GeomFromText('POINT(2.1228 41.380)'),ST_GeomFromText('POINT(2.1511 41.374)'),ST_GeomFromText('POINT(2.1528 41.413)'),ST_GeomFromText('POINT(2.165 41.391)'),ST_GeomFromText('POINT(2.1498 41.371)'),ST_GeomFromText('POINT(2.1533 41.368)'),ST_GeomFromText('POINT(2.131386 41.41399)')] AS g
 )
-SELECT CDB_SpatialInterpolation(g, vals, ST_GeomFromText('POINT(2.154 41.37)'),1) FROM a;
+SELECT
+    CDB_SpatialInterpolation(g, vals, ST_GeomFromText('POINT(2.154 41.37)'),0) as NN,
+    CDB_SpatialInterpolation(g, vals, ST_GeomFromText('POINT(2.154 41.37)'),1) as NNI,
+    CDB_SpatialInterpolation(g, vals, ST_GeomFromText('POINT(2.154 41.37)'),2) as IDW
+FROM a;